Optics: image projectors – Picture carrier
Patent
1993-03-03
1996-01-23
Dowling, William C.
Optics: image projectors
Picture carrier
353DIG3, 40159, G03B 2164
Patent
active
054868831
ABSTRACT:
A protector adapted to accommodate a transparency to maintain it in a clean, dust-free and dry condition so that it may be used with an overhead optical projector to cast the image carried by the transparency onto a viewing screen. The protector is constituted by an open-ended rectangular sleeve whose dimensions are appropriate to those of the transparency, the sleeve including a front panel formed of transparent, acetate film that is breathable to permit a transparency inserted in the sleeve in a wet state to dry out. Also included is a rear panel formed of a transparent, synthetic plastic film of high strength having the same length as the front panel and joined thereto at one side edge to form a folder to receive the transparency so that it is then sandwiched between the panels. The width of the rear panel is greater than that of the front panel to form a flap that is folded over to define at the other side edge of the sleeve a margin that can be provided with a set of punch holes whereby the transparency-loaded protector can be kept when not in use in a ring binder or file.
REFERENCES:
patent: 3869201 (1975-03-01), Lysle
patent: 4402585 (1983-09-01), Gardlund
patent: 4810544 (1989-03-01), Hickman
patent: 4814216 (1989-03-01), Brunett et al.
patent: 4925720 (1990-05-01), Hansen
Dowling William C.
Ebert Michael
Enbee Plastics, Inc.
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